I checked with the team about this: in working on the
iPhone version of Forecast view, we figured out some performance improvements that we'll port back to the iPad's version in an upcoming release.
In the meantime, there are a couple things that may help folks understand what's going on.
The first thing to know is that how long it takes to switch to Forecast view depends on the number of items in your database. If you sync with a Mac, the
usual tricks - archiving completed actions rather than keeping them in your database, for example - will make switching to Forecast view faster.
Another thing to know is that the A5 has much faster
graphics capabilities, but in terms of clock speed, it's actually identical to the previous chip. It's got two processor cores you can throw things at, which is great. But it's like sticking two engines in a car; you can do the extra work that takes and it will make the car somewhat faster. Just not twice as fast.
Games are a little bit of an exception here. Apple worked hard on the graphical side of things - those got 'up to nine times faster' according to their website. Games do a lot of drawing, so you're going to see
much faster performance there.
General purpose computing and data-crunching tasks won't see the same degree of improvement, though. In this case, the latter part of the process is more relevant.
Hope this helps!